Update dependency ember-fetch to v8.0.4

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ember-fetch	8.0.2 -> 8.0.4

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Release Notes

ember-cli/ember-fetch

### [`v8.0.4`](https://togithub.com/ember-cli/ember-fetch/blob/master/CHANGELOG.md#v804-2021-01-18) [Compare Source](https://togithub.com/ember-cli/ember-fetch/compare/v8.0.3...v8.0.4) ##### :house: Internal - [#​586](https://togithub.com/ember-cli/ember-fetch/pull/586) Update `.npmignore` file ([@​Turbo87](https://togithub.com/Turbo87)) ##### Committers: 1 - Tobias Bieniek ([@​Turbo87](https://togithub.com/Turbo87)) ### [`v8.0.3`](https://togithub.com/ember-cli/ember-fetch/blob/master/CHANGELOG.md#v803-2021-01-18) [Compare Source](https://togithub.com/ember-cli/ember-fetch/compare/v8.0.2...v8.0.3) ##### :bug: Bug Fix - [#​568](https://togithub.com/ember-cli/ember-fetch/pull/568) Updates the type for data property to be less restrictive. ([@​LuisAverhoff](https://togithub.com/LuisAverhoff)) ##### Committers: 3 - Luis Manuel Averhoff ([@​LuisAverhoff](https://togithub.com/LuisAverhoff)) - Thomas Wang ([@​xg-wang](https://togithub.com/xg-wang)) - [@​dependabot-preview\[bot\]](https://togithub.com/apps/dependabot-preview)

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